diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 50f0a58..7b2b4af 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,8 @@ permissions:
 jobs:
   build:
     name: 🧪 Test & lint
-    runs-on: ubuntu-latest
+    # Python 3.8 and 3.9 have no builds for ubuntu-26.04, which ubuntu-latest now points to.
+    runs-on: ubuntu-24.04
     strategy:
       fail-fast: false
       max-parallel: 1
@@ -40,7 +41,7 @@ jobs:
 
       - name: Test with ${{ matrix.python }}
         env:
-          STREAM_KEY: ${{ secrets.STREAM_KEY }}
+          STREAM_KEY: ${{ vars.STREAM_KEY }}
           STREAM_SECRET: ${{ secrets.STREAM_SECRET }}
           PYTHONPATH: ${{ github.workspace }}
         run: make test
diff --git a/.github/workflows/scheduled_test.yml b/.github/workflows/scheduled_test.yml
index 8b97e0b..9c95b1f 100644
--- a/.github/workflows/scheduled_test.yml
+++ b/.github/workflows/scheduled_test.yml
@@ -25,7 +25,7 @@ jobs:
 
       - name: Test
         env:
-          STREAM_KEY: ${{ secrets.STREAM_KEY }}
+          STREAM_KEY: ${{ vars.STREAM_KEY }}
           STREAM_SECRET: ${{ secrets.STREAM_SECRET }}
           PYTHONPATH: ${{ github.workspace }}
         run: |